Monkeys don’t wear jackets
If you want to know about monkey jackets, read on. A MONKEY JACKET is a short coat worn by seamen. It is called a monkey jacket because it has “no more a tail than a monkey”, says the dictionary.
Um… But both Old World and New World monkeys have tails (with just one exception). It’s apes – aka chimps, gorillas, orangutans, Curious George, and me – who don’t have tails. So whoever named it a monkey jacket meant to say an APE JACKET.